Complex operational environment, tight deadlines or fast-tracked projects, high demands from multiple stakeholders within the organization, or outside the organization as a customer; presents significant challenges in the engineering sector, including Mechanical, Electrical, Plumbing (MEP) sector, and energy retrofit projects in the UAE, which can result in delays in projects. Project delays pose challenges including increased project budgets and stakeholder or customer dissatisfaction. Energy efficiency and sustainability, are two of the primary motivators for the UAE construction and engineering industry; which are impacted negatively by project delays. This research provides a quantitative analysis of project delays of three comprehensive real-world case studies (MEP and energy retrofit projects) at one engineering firm in the UAE. Retrospective delay analysis of As Built versus As Planned has been used to: quantify the delays, test and identify and categories the primary and secondary causes of delays, measure their time impact and critical contributions. Root Cause Analysis, Gantt Chart, Risk Assessment and Mitigation Strategies were done in this analysis. Key findings highlight: internal processes, procurement and supply chain, and insufficiencies, client related delays as major contributor to delays. This dissertation provides useful insight into delay management proactively and provides actionable strategies that is tailored to the unique nature of MEP and energy projects. Future recommendations and limitations of this research paper has been identified in order to adapt and evolve to project and market requirements in the UAE.